Determine if the matrix A = [ 3 1 | -2 4 ] is invertible

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1. Find the derivative of f(x) = ln(x + 1).
2. Calculate the integral ∫(2x - sin(x) + π) dx
3. Determine if the matrix A = [ 3 1 | -2 4 ] is invertible
4. Greatest Common Divisor of 36 and 48